共查询到20条相似文献,搜索用时 15 毫秒
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Dmitry S. Goncharov Ivan V. Kulakov Alexander S. Fisyuk 《Chemistry of Heterocyclic Compounds》2017,53(12):1335-1339
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A. M. Golyakov A. N. Borisov G. A. Shagisultanova A. L. Shpilev 《Russian Journal of General Chemistry》2011,81(9):1867-1872
The electrochemical oxidation of N,N′-bis(3-methoxysalicylidene)-1,3-propylenediamine leads to the formation of conducting polymer on the electrode surface. The decisive role of phenol oxygen in the formation of the polymeric forms of azomethine bases was elucidated. Optimal conditions for the synthesis of the polymer in the potentiostatic conditions were revealed. The coefficient of the charge diffusion and the activation barrier for the charge transfer in the polymer bulk in the electrolyte medium were determined. 相似文献
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Mohan T. Hosamani Narasimha H. Ayachit D. K. Deshpande 《Journal of Thermal Analysis and Calorimetry》2012,107(3):1301-1306
Thermodynamic parameters, like, change of activation energy for dipole orientation (ΔG*), enthalpy (ΔH*), and entropy (ΔS*) of activation in the case of binary-, ternary-, etc. mixtures of polar molecules in pure liquid phase or in dilute solution phase in a non polar solvent helps in drawing certain quantitative conclusions regarding their relaxation behavior as to whether a single component is responsible for observed microwave absorption or a cooperative phenomenon (average) by all the dipoles of the mixture contribute to it. Dielectric relaxation behavior of polar molecules in a non-polar solvent, or mixtures of these substances at different microwave frequencies and over a range of temperatures and concentrations give a method of determining these quantities. Such an experimental investigation on verity of systems is necessary to draw quantitative conclusions regarding the system of the molecules which are not studied so as to examine if the results obtained are in favor or against the general conclusions already arrived at, in other systems. With this in view, systematic dielectric measurements in a range of temperatures are carried out at a single microwave frequency on a single weight fraction in benzene of the four substituted indoles, namely, 5-Bromoindole, 5-Fluoroindole, 2,3-Dimethylindole, 2,5-Dimethylindole and on binary (1:1) mixtures of 2,5-Dimethylindole + 5-Bromoindole and 2,3-Dimethylindole + 5-Fluoroindole in benzene as solvent at different temperatures. The results are presented and discussed. 相似文献
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Yunchun Wang Zhongyuan Bai Zengjun Wei Shengzhen Xu Xuegang Li Jianhong Li Xiufang Cao Changshui Chen 《Research on Chemical Intermediates》2011,37(8):1029-1039
Twenty-two novel N-nitro-N′-substituted phenyl-N-(2,6-dibromo-4-fluorophenyl)urea derivatives were designed and synthesized via a simple and convenient BTC ‘one-pot’ procedure using DMAP as the catalyst. The structures of all newly synthesized compounds were confirmed by IR, 1H NMR, and elemental analysis, and a part has been identified by 13C NMR. The preliminary bioassay indicates that the target compounds possesses moderate herbicidal activity against Sorghum sudanense. However, some of the title compounds presented high plant growth regulating activity against rape. 相似文献
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A. S. Vanetsev O. M. Gaitko I. G. Chuvashova M. N. Sokolov Yu. D. Tret’yakov 《Doklady Chemistry》2011,441(1):325-329
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I. A. Kirovskaya L. V. Novgorodtseva S. O. Podgorodnyi 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2010,84(5):820-825
Solid substitutional solutions of cubic (sphalerite) lattice based on the binary semiconducting compounds GaSb and ZnTe in the range of their mutual solubility were synthesized. Their identification was performed on the basis of X-ray and electrophysical studies. 相似文献
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Guo-Wei Yu Qiang Cheng Jing Nie Xia-Jun Wang Peng Wang Zu-Guang Li Maw-Rong Lee 《Chromatographia》2018,81(4):657-667
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The reaction between Re2(DMBA)4Cl2 and NaN(CN)2 resulted in Re2(DMBA)4(N(CN)2)2 (1a), where DMBA is N,N′-dimethylbenzamidinate. Molecular compounds Re2(DMBA)4(ReO4)2 (1b) and Re2(DMBA)4(OP(O)(OH)Ph)2 (1c) were obtained through the reactions between Re2(DMBA)4(NO3)2 and the respective monoanion. The dirhenium(III) coordination polymers [Re2(DMBA)4(μ-O,O′-WO4)·2H2O]∞ (2a), [Re2(DMBA)4(μ-O,O′-MoO4)·2H2O]∞ (2b), and [Re2(DMBA)4(μ-O,O′-1,4-(O2C)2C6H4)·2H2O]∞ (2c) were similarly prepared through slow diffusion of Re2(DMBA)4(NO3)2 in acetonitrile into aqueous solution containing the respective dianion. All new compounds were characterized with single
crystal X-ray diffraction, which revealed the retention of the essential structural features of Re2(DMBA)4 unit upon the formation of coordination polymers. 相似文献
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M. Roy Praniti Dave Shiv Kumar Barbar Sumit Jangid D. M. Phase A. M. Awasthi 《Journal of Thermal Analysis and Calorimetry》2010,101(3):833-837
The polycrystalline ferroelectric compounds of general formula Pb1−X Ba X TiO3 with X = 0.00, 0.1, 0.2 and 0.5 were prepared by high temperature solid-state reaction technique using high purity oxides and carbonates. The compounds formation was confirmed by X-ray diffraction and all the X-ray peaks were indexed with tetragonal structure of space group P4mm. Morphology and particle size of the compounds were obtained using scanning electron microscopy. Ferroelectric phase transition, enthalpy change, and specific heat of the compounds were obtained using modulated differential scanning calorimetry. It was observed that the phase transition temperature decreased linearly with the increase of substitution concentration. 相似文献
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In the traditional research of volatile compounds, some trace-level compounds could not be identified by gas chromatography-mass spectrometry. Target and post-targeted methods were applied in the investigation of trace-level volatile compounds in fresh turf crop (Lolium perenne L.) based on gas chromatography in combination with hybrid quadrupole time-of-flight mass spectrometry. According to literatures published, a target analysis was performed by using retention index, accurate masses of characteristic ions and second-stage mass spectra (MS2 spectra). And a series of experiments showed that low electron impact energy was beneficial to the improvement of the abundances of low abundance molecular ion peak. peak was beneficial to qualitative analysis. Totally, 60 Enhancing the abundances of low abundance molecular ion volatile compounds were identified, the great majority cornpounds of which were benzeneacetaldehyde (14.8%), 2,5-dimethyl-pyrazine (9.6%), and hexanal (9.3%). Identification was complied by mass spectral search, retention index and accurate masses of characteristic ions. 相似文献